I have some. Weigh the possibilities carefully, especially if you are married. I've been poking around this internet thing since they invented it and I have run the full circle of watching and engaging in online relationships...trying to transition into real relationships...and also doing it while I was married and seeing my wife do it while we were married (which we are not as of 10 years ago). It can be lots of fun...but can have real impact on your life too.
I know we have long time members who are in online relationships...and some in real relationships who started online. There's nothing wrong with that.
I have known people who left 10 and 15 years marriages for an online lover, only to find themselves alone in 6 months. I have also known people who met online and have great relationships...so far.
My only advice would be to tread lightly and think about the impact it may have down the road. It may be positive but it may also be negative.
I could write a book about my opinion on this...but that would bore the piss out of everyone and would still be just my opinion!
Good luck to you, I'm sure you'll get a lot of response on this post.